Problem 1 :
Graph f(x) = x and g(x) = x - 5. Then describe the transformation from the graph of f(x) to the graph of g(x).
Problem 2 :
Graph f(x) = x + 2 and g(x) = 2x + 2. Then describe the transformation from the graph of f(x) to the graph of g (x) .
Problems 3-4 : Graph f(x). Then reflect the graph of f(x) across the y-axis. Write a function g(x) to describe the new graph.
Problem 3 :
f(x) = x
Problem 4 :
f(x) = -4x - 1
Problem 5 :
Graph f(x) = x and g(x) = 3x + 1. Then describe the transformations from the graph of f(x) to the graph of g(x).
Problem 6 :
A trophy company charges $175 for a trophy plus $0.20 per letter for the engraving. The total charge for a trophy with x letters is given by the function f(x) = 0.20x + 175. How will the graph change if the trophy’s cost is lowered to $172? if the charge per letter is raised to $0.50?
1. Answer :
The graph of g(x) = x - 5 is the result of translating the graph of f(x) = x, 5 units down.
2. Answer :
The graph of g(x) = 2x + 2 is the result of rotating the graph of f(x) = x + 2 about (0, 2). The graph of g(x) is steeper than the graph of f(x).
3. Answer :
To find g(x), multiply the value of m by -1.
In f(x) = x, m = 1.
1(-1) = -1 This is the value of m for g(x).
g(x) = -x
4. Answer :
To find g(x), multiply the value of m by -1.
In f(x) = -4x - 1, m = -4.
-4(-1) = 4 This is the value of m for g(x).
g(x) = 4x - 1
5. Answer :
Find transformations of f(x) = x that will result in g(x) = 3x + 1 :
• Multiply f(x) by 3 to get h(x) = 3x. This rotates the graph about (0, 0) and makes it steeper.
• Then add 1 to h(x) to get g(x) = 3x + 1. This translates the graph 1 unit up.
The transformations are a rotation and a translation.
6. Answer :
f(x) = 0.20x + 175 is graphed in blue.
If the trophy’s cost is lowered to $172, the new function is g(x) = 0.20x + 172. The original graph will be translated 3 units down.
If the charge per letter is raised to $0.50, the new function is h(x) = 0.50x + 175. The original graph will be rotated about (0, 175) and become steeper.
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